How would they prevent it? If they allow your app to read a value client side, it can do whatever it wants with it, including sending it.
If your app needs to present different behavior based on user settings, it needs to read it.
How would they prevent it? If they allow your app to read a value client side, it can do whatever it wants with it, including sending it.
If your app needs to present different behavior based on user settings, it needs to read it.